公开(公告)号：US06738709B2

公开(公告)日：2004-05-18

申请号：US10153637

申请日：2002-05-24

申请人： Kenji Saito ,  Satoshi Nagashima ,  Yoichiro Ando ,  Hidetsugu Kanao

发明人： Kenji Saito ,  Satoshi Nagashima ,  Yoichiro Ando ,  Hidetsugu Kanao

IPC分类号： G06F1900

CPC分类号： F02M25/0809

摘要： A failure diagnostic system reduces the internal pressure of a fuel tank to a predetermined negative pressure, seals off the fuel tank from the air, and then determines whether an evaporated fuel processing system has failed or not by monitoring an increase in pressure in the fuel tank. In determination, the failure diagnostic system compares a detected pressure in the fuel tank with a reference value that is increased by a predetermined rate. The failure diagnostic system stops update of the detected pressure if the detected pressure becomes higher than the reference value, and resumes update of the detected pressure if the detected pressure becomes lower than the reference value. It is therefore possible to accurately determine whether the evaporated fuel processing system has failed or not even if the pressure in the fuel tank is rapidly increased.

摘要翻译： 故障诊断系统将燃料箱的内部压力降低到预定的负压，将燃料箱与空气密封，然后通过监视燃料箱中的压力增加来确定蒸发燃料处理系统是否发生故障 。 在确定时，故障诊断系统将检测到的燃料箱中的压力与以预定速率增加的参考值进行比较。 如果检测到的压力高于参考值，则故障诊断系统停止检测到的压力的更新，并且如果检测到的压力变得低于参考值，则恢复检测到的压力的更新。 因此，即使燃料箱中的压力快速增加，也可以精确地确定蒸发燃料处理系统是否发生故障。

公开(公告)号：US06834227B2

公开(公告)日：2004-12-21

申请号：US10601622

申请日：2003-06-24

申请人： Kenji Saito ,  Hidetsugu Kanao

发明人： Kenji Saito ,  Hidetsugu Kanao

IPC分类号： F02M2508

CPC分类号： F02M25/0809

摘要： When a first restoring pressure amount, measured after a fault diagnosis object region is in a reduced pressure state, exceeds a first or second judgment value, a second restoring pressure amount is measured by releasing the fault diagnosis object region to the atmosphere and then sealing it. When the first restoring pressure amount is between the first and second judgment values, the second restoring pressure amount is compared with a third judgment value. When the first restoring pressure amount exceeds the second judgment value, the second restoring pressure amount is compared with a fourth judgment value. Leak is determined to exist when the first restoring pressure amount exceeds the first judgment value and the second restoring pressure amount does not exceed the third judgment value, or when the first restoring pressure amount exceeds the second judgment value and the second restoring pressure amount does not exceed the fourth judgment value.

摘要翻译： 当在故障诊断对象区域处于减压状态之后测量的第一恢复压力量超过第一或第二判断值时，通过将故障诊断对象区域释放到大气中然后密封来测量第二恢复压力量 。 当第一恢复压力量在第一和第二判断值之间时，将第二恢复压力量与第三判断值进行比较。 当第一恢复压力量超过第二判断值时，将第二恢复压力量与第四判断值进行比较。 当第一恢复压力量超过第一判断值并且第二恢复压力量不超过第三判断值时，或当第一恢复压力量超过第二判断值且第二恢复压力量不为第二恢复压力量时，确定存在泄漏 超过第四判断值。

公开(公告)号：US06651491B2

公开(公告)日：2003-11-25

申请号：US10153793

申请日：2002-05-24

申请人： Kenji Saito ,  Satoshi Nagashima ,  Yoichiro Ando ,  Hidetsugu Kanao

发明人： Kenji Saito ,  Satoshi Nagashima ,  Yoichiro Ando ,  Hidetsugu Kanao

IPC分类号： G01L326

CPC分类号： F02M25/0809 ,  F02M25/0836

摘要： There is provided a failure diagnostic system of an evaporated fuel processing system, which comprises a first failure diagnostic device that shuts off an evaporated fuel purge passage connecting a fuel tank and an engine intake passage from the air and determines whether there is any leakage from a large hole by monitoring the degree of increase in pressure in the fuel tank in which engine intake negative pressure is introduced; and a second failure diagnostic device that reduces a pressure the fuel tank to a predetermined negative pressure and seals off the fuel tank from the air to carry out failure diagnosis as to whether there is any leakage from a small hole by monitoring the degree of increase in pressure in the fuel tank. An operating range of the second failure diagnostic device is set to substantially include an operating range of the first failure diagnostic device and to be extended from the operating range of the first failure diagnostic device to include a lower intake negative pressure range.

摘要翻译： 提供了一种蒸发燃料处理系统的故障诊断系统，其包括第一故障诊断装置，其关闭从空气连接燃料箱和发动机进气通道的蒸发燃料吹扫通道，并确定是否存在来自 通过监测引入发动机进气负压的燃料箱中的压力增加程度来监测大孔; 以及第二故障诊断装置，其将燃料箱的压力减小到预定的负压，并且将燃料箱与空气密封，以通过监视来自小孔的泄漏程度进行故障诊断 燃油箱内的压力。 第二故障诊断装置的操作范围被设定为基本上包括第一故障诊断装置的操作范围，并且从第一故障诊断装置的操作范围延伸到包括较低的进气负压范围。

公开(公告)号：US06880380B2

公开(公告)日：2005-04-19

申请号：US10326998

申请日：2002-12-24

申请人： Satoshi Nagashima ,  Kenji Saito ,  Hidetsugu Kanao

发明人： Satoshi Nagashima ,  Kenji Saito ,  Hidetsugu Kanao

IPC分类号： F02D45/00 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N13/02 ,  F02D37/02 ,  F02D41/14 ,  F02D41/22 ,  G01N33/00 ,  G01N33/497 ,  G01N7/00

CPC分类号： F01N3/101 ,  F01N3/20 ,  F01N3/28 ,  F01N13/009 ,  F01N13/0093 ,  F02D37/02 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1474 ,  F02D41/1495 ,  F02D41/187 ,  F02D41/222 ,  F02D2041/2027 ,  F02D2041/228 ,  F02D2200/0404 ,  F02D2200/0414 ,  G01N33/0004 ,  Y02T10/22 ,  Y02T10/40

摘要： A failure diagnostic apparatus for an air-fuel ratio detecting device has an exhaust emission purifying device provided in an exhaust passage; an air-fuel ratio detecting unit for detecting the air-fuel ratio of an exhaust gas from the purifying device; a first determination unit for determining that the air-fuel ratio is estimated to be rich for longer than a first predetermined period of time; a second determination unit for determining that the air-fuel ratio is estimated to be lean for longer than a second predetermined period of time; and a failure diagnosis device for determining that the air-fuel ratio detecting device has failed if a variation in the air-fuel ratio, calculated based on the detected air-fuel ratios until both the first and second determination units make the determinations, is equal to or less than a predetermined value.

摘要翻译： 空燃比检测装置的故障诊断装置具有设置在排气通路内的排气净化装置， 用于检测来自净化装置的废气的空燃比的空燃比检测单元; 第一确定单元，用于确定所述空燃比被估计为富于长于第一预定时间段; 第二确定单元，用于确定空燃比被估计为比第二预定时间长; 以及故障诊断装置，用于如果基于检测到的空燃比而计算的空燃比的变化直到第一和第二确定单元进行确定，则确定空燃比检测装置已经失败。 达到或小于预定值。

公开(公告)号：US06397824B1

公开(公告)日：2002-06-04

申请号：US09633345

申请日：2000-08-04

申请人： Takashi Takatsuka ,  Hidetsugu Kanao ,  Tomonobu Sakagami ,  Kenji Saito ,  Tateo Kume ,  Haruki Fukuda

发明人： Takashi Takatsuka ,  Hidetsugu Kanao ,  Tomonobu Sakagami ,  Kenji Saito ,  Tateo Kume ,  Haruki Fukuda

IPC分类号： F02M3302

CPC分类号： F02D41/22 ,  F02M25/0809

摘要： A fault diagnosing apparatus for evapopurge systems, including a device adapted to detect a pressure in the interior of an evapopassage including a fuel tank, a depressurization device adapted to close a first valve provided in an atmosphere-opened port of a canister and depressurize the interior of the evapopassage by a negative pressure occurring in a suction passage of an internal combustion engine, a repressurization device adapted to close a second valve after the operation of the depressurization device finishes, to repressurize the interior of the evapopassage, and a fault judgement device adapted to allow a judgement, which is based on an output from the pressure detecting device, that an evapopurge system is abnormal to be given on condition that the depressurization and repressurization devices are operated plural times.

摘要翻译： 一种用于蒸发系统的故障诊断装置，包括适于检测包括燃料箱的蒸发器内部的压力的装置，适于关闭设置在罐的大气开放端口中的第一阀的减压装置，并且使内部 通过在内燃机的吸入通道中产生的负压引起的蒸发作用，在减压装置的运转结束后适合关闭第二阀的再加压装置，对蒸发器的内部进行再加压，以及适应的故障判断装置 为了允许基于来自压力检测装置的输出的判断，在减压和再加压装置多次操作的条件下，蒸发系统异常。

公开(公告)号：US5754971A

公开(公告)日：1998-05-19

申请号：US599313

申请日：1996-02-09

申请人： Takuya Matsumoto ,  Mitsuhiro Miyake ,  Toru Hashimoto ,  Toshiro Nomura ,  Hidetsugu Kanao

发明人： Takuya Matsumoto ,  Mitsuhiro Miyake ,  Toru Hashimoto ,  Toshiro Nomura ,  Hidetsugu Kanao

IPC分类号： F02D41/00 ,  F02D41/22 ,  F02M25/08 ,  G06G7/70

CPC分类号： F02M25/0809 ,  F02D41/0032

摘要： A fault diagnosis apparatus for a fuel evaporative emission suppressing system has an electronic control unit which inputs an average value of integral terms for air-fuel ratio feedback control, engine speed, etc. when diagnosis executing conditions are satisfied, and then starts opening operation of a purge control valve. Subsequently, the average value of integral terms, engine speed, etc. are input again. If no substantial change occurs in the average value, etc. with driving of the purge control valve, it is concluded that purge air for fault diagnosis has not been introduced, and that the suppressing system is faulty. In driving the purge control valve, its driving duty ratio is increased by a relatively small increment till the driving duty ratio reaches a predetermined duty ratio. If the system is normal, therefore, a purge-air introduction amount for fault diagnosis is increased by a relatively small increasing degree, to thereby prevent fluctuation of the air-fuel ratio or engine output torque attributable to the purge air introduction. After the driving duty ratio has reached the predetermined duty ratio, the driving duty ratio is increased by a relatively large increment, to thereby rapidly execute the purge-air introduction and fault diagnosis.

摘要翻译： 燃料蒸发排放抑制系统的故障诊断装置具有电子控制单元，当满足诊断执行条件时，输入空燃比反馈控制，发动机转速等的积分项的平均值，然后开始打开操作 清洗控制阀。 随后，再次输入积分项，发动机转速等的平均值。 如果在清洗控制阀的驱动下，平均值等没有发生实质性变化，则认为没有引入用于故障诊断的吹扫空气，并且抑制系统有故障。 在驱动排气控制阀时，其驱动占空比增加相对较小的增量，直到驱动占空比达到预定的占空比。 因此，如果系统正常，则用于故障诊断的吹扫空气引入量增加相对较小的增加程度，从而防止归因于吹扫空气引入的空燃比或发动机输出转矩的波动。 在驱动占空比达到预定占空比之后，驱动占空比增加相对较大的增量，从而快速地执行吹扫空气引入和故障诊断。

公开(公告)号：US5575267A

公开(公告)日：1996-11-19

申请号：US537293

申请日：1995-09-29

申请人： Takuya Matsumoto ,  Toru Hashimoto ,  Mitsuhiro Miyake ,  Hitoshi Kamura ,  Yasuhisa Yoshida ,  Hidetsugu Kanao ,  Toshiro Nomura

发明人： Takuya Matsumoto ,  Toru Hashimoto ,  Mitsuhiro Miyake ,  Hitoshi Kamura ,  Yasuhisa Yoshida ,  Hidetsugu Kanao ,  Toshiro Nomura

IPC分类号： F02D41/22 ,  F02M25/08 ,  F02D41/00 ,  F02M33/02

CPC分类号： F02D41/221 ,  F02M25/0809 ,  Y02T10/40

摘要： A fault diagnosis apparatus for detecting a fault in a fuel evaporative emission suppressing system comprises an electronic control unit. When fault diagnosis execution conditions are fulfilled, the electronic control unit stores an average of integral term values for air-fuel ratio feedback control, operating position of an idling speed control valve, and engine speed, and then actuates a purge control valve of the suppressing system so that the valve opens. In a predetermined time period after the actuation of the purge control valve, the integral term average and the like are stored again. If any changes of the integral term average and other values caused by the actuation of the purge control valve are detected, the suppressing system is concluded to be normal. If no changes are detected, on the other hand, the suppressing system is concluded to be faulty.

摘要翻译： 用于检测燃料蒸发排放抑制系统中的故障的故障诊断装置包括电子控制单元。 当满足故障诊断执行条件时，电子控制单元存储空燃比反馈控制的积分项值，空转速度控制阀的操作位置和发动机转速的平均值，然后启动抑制 系统使阀门打开。 在清除控制阀的致动之后的预定时间段内，再次存储积分项平均值等。 如果检测到由清除控制阀的致动引起的积分项平均值和其他值的任何变化，则抑制系统被认定为正常。 另一方面，如果没有检测到变化，则抑制系统被认定为有故障。

公开(公告)号：US06532808B1

公开(公告)日：2003-03-18

申请号：US09570540

申请日：2000-05-12

申请人： Takuya Matsumoto ,  Yoshiaki Higuchi ,  Tateo Kume ,  Hidetsugu Kanao ,  Tomonobu Sakagami

发明人： Takuya Matsumoto ,  Yoshiaki Higuchi ,  Tateo Kume ,  Hidetsugu Kanao ,  Tomonobu Sakagami

IPC分类号： G01M1500

CPC分类号： F02D41/222 ,  F01P11/16 ,  F01P2023/00 ,  F01P2031/20 ,  F01P2031/32 ,  F02D41/187 ,  F02D2200/0414 ,  Y02T10/40

摘要： In a thermostat failure diagnosis apparatus for an internal combustion engine in which a failure diagnosis of a thermostat can be effectively made, in the case where, after starting of the engine, an intake air quantity of the engine or a parameter related to the intake air quantity is equal to or higher than a predetermined value, and a cooling water temperature is equal to or higher than an intake air temperature (outside air temperature), on the basis of a time in which a rising quantity in the cooling water temperature at an upstream side of the thermostat reaches a predetermined value, or a time in which the cooling water temperature rises to a predetermined temperature, the failure of the thermostat is judged. By this, the failure diagnosis is not made in the state where an engine generating heat quantity is small so that there is a fear that an erroneous diagnosis occurs, and the failure diagnosis of the thermostat can be rationally made only in the state where the engine generating heat quantity is large to some degree so that there is no fear of erroneous diagnosis.

公开(公告)号：US06752011B2

公开(公告)日：2004-06-22

申请号：US10350106

申请日：2003-01-24

申请人： Takuya Matsumoto ,  Yoshiaki Higuchi ,  Tateo Kume ,  Hidetsugu Kanao ,  Tomonobu Sakagami

发明人： Takuya Matsumoto ,  Yoshiaki Higuchi ,  Tateo Kume ,  Hidetsugu Kanao ,  Tomonobu Sakagami

IPC分类号： G01M1500

CPC分类号： F02D41/222 ,  F01P11/16 ,  F01P2023/00 ,  F01P2031/20 ,  F01P2031/32 ,  F02D41/187 ,  F02D2200/0414 ,  Y02T10/40

摘要： In a thermostat failure diagnosis apparatus for an internal combustion engine in which a failure diagnosis of a thermostat can be effectively made, in the case where, after starting of the engine, an intake air quantity of the engine or a parameter related to the intake air quantity is equal to or higher than a predetermined value, and a cooling water temperature is equal to or higher than an intake air temperature (outside air temperature), on the basis of a time in which a rising quantity in the cooling water temperature at an upstream side of the thermostat reaches a predetermined value, or a time in which the cooling water temperature rises to a predetermined temperature, the failure of the thermostat is judged. By this, the failure diagnosis of the thermostat can be rationally made only when the engine generating heat quantity is large to some degree to prevent erroneous diagnosis.

摘要翻译： 在用于内燃机的恒温器故障诊断装置中，其中可以有效地进行恒温器的故障诊断，在发动机起动之后，发动机的进气量或与进气有关的参数的情况下 数量等于或高于预定值，并且冷却水温度等于或高于进气温度（室外空气温度），其基于冷却水温度的上升量 恒温器的上游侧达到预定值，或者冷却水温度上升到预定温度的时间，判断恒温器的故障。 由此，只有在发动机发热量大到一定程度时才能合理地进行恒温器的故障诊断，以防止误诊。

公开(公告)号：US5732552A

公开(公告)日：1998-03-31

申请号：US599314

申请日：1996-02-09

申请人： Takuya Matsumoto ,  Toru Hashimoto ,  Mitsuhiro Miyake ,  Toshiro Nomura ,  Hidetsugu Kanao

发明人： Takuya Matsumoto ,  Toru Hashimoto ,  Mitsuhiro Miyake ,  Toshiro Nomura ,  Hidetsugu Kanao

IPC分类号： F01N11/00 ,  F01N3/20

CPC分类号： F01N11/007 ,  F01N2550/02 ,  F01N2900/0422 ,  Y02T10/22 ,  Y02T10/47

摘要： A deterioration diagnostic apparatus for a three-way catalyst includes an electronic control unit, which obtains a frequency of reversals of the changing direction in which the output of an upstream-side O.sub.2 sensor changes, based on the number of times the output voltage of the O.sub.2 sensor crosses a threshold. Also, the control unit obtains a frequency of reversals of the changing direction in which the output of a downstream-side O.sub.2 sensor changes, based on the number of times the output voltage of the downstream-side O.sub.2 sensor crosses upper and lower reversal reference values which are obtained by adding and subtracting a hysteresis constant to and from an average value of input values of the downstream-side O.sub.2 sensor output voltage. The control unit further obtains the ratio of the reversal frequency of the downstream-side sensor output to the reversal frequency of the upstream-side sensor output, and diagnoses deterioration of the three-way catalyst when the reversal frequency ratio has become greater than a predetermined value.

摘要翻译： 用于三元催化剂的劣化诊断装置包括电子控制单元，其基于上游侧O2传感器的输出改变的次数获得上游侧O2传感器的输出变化的变化方向的反转频率 O2传感器超过阈值。 此外，控制单元根据下游侧O2传感器的输出电压与上下反转基准值相交的次数，得到下游侧O2传感器的输出变化的变化方向的反转频率 其通过向下游侧O2传感器输出电压的输入值的平均值加减去滞后常数而得到。 控制单元还获得下游侧传感器输出的反转频率与上游侧传感器输出的反转频率的比，并且当反转频率比已经变得大于预定频率比时，诊断三元催化剂的劣化 值。